No, please don't. I understand the desire but my fear would be by trying to stop these so called "fake" clients that you might hinder some really good ones. More specifically I am worried you might hinder clients I want to work with. I don't want anything more to be done to give them pause in deciding to bring their work here.

I understand that the price of that is I have to wade through lots of jobs and throw pot shots at ones that seem like my kind of work and never, ever hear back from something like 99% of them. I don't care if they were fake or just didn't find anyone they liked (including me), I have to learn to just be tougher than that. I have to learn that the money I spent on connects in aggregate is nothing if I can find work that returns enough value to me. I need to learn to make enough on my work to cover my expenses or I really don't have a business.

Good clients are rare. Freelancers are almost endless. It makes no sense to try and make it fair.